| 2025年 | 2026年 | 平年値 | |
| 5-16 | 19.5 | 21.3 | 18.9 |
| 5-17 | 20.2 | 20.9 | 19 |
| 5-18 | 19.9 | 21.4 | 19.2 |
| 5-19 | 20.2 | 21.6 | 19.3 |
| 5-20 | 20.6 | 21.6 | 19.2 |
| 5-21 | 21 | 22 | 19.3 |
| 5-22 | 20.9 | 21.7 | 19.7 |
| 5-23 | 21.3 | 21.8 | 20 |
| 5-24 | 21.3 | 21.6 | 20.1 |
| 5-25 | 21.4 | 21.7 | 20.2 |
| 5-26 | 21.4 | 22 | 20.7 |
| 5-27 | 21.3 | 21.8 | 20.4 |
| 5-28 | 21.5 | 22.2 | 20.5 |
| 5-29 | 21.8 | 22.6 | 20.7 |
| 5-30 | 21.4 | --- | 20.8 |